You can unscramble the hashes of humanity's 5 billion email addresses in ten milliseconds for $0.0069

[roomwithaview]

@JonS

But what if Company A wants to match their data with the data held by Company B, in order to create a richer data set about all users?

That’s the point, they can’t!


(Which is why nobody will ever actually hash anything properly in a shared dataset. Bastards…)